[PATCH v6 2/6] drm/i915/gen8: Re-order init pipe_control in lrc mode

[Arun Siluvery <arun.siluvery@linux.intel.com>]

Some of the WA applied using WA batch buffers perform writes to scratch page.
In the current flow WA are initialized before scratch obj is allocated.
This patch reorders intel_init_pipe_control() to have a valid scratch obj
before we initialize WA.

v2: Check for valid scratch page before initializing WA as some of them
perform writes to it.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index c9255fc..0d350f6 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1223,6 +1223,12 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring)
 
 	WARN_ON(ring->id != RCS);
 
+	/* some WA perform writes to scratch page, ensure it is valid */
+	if (ring->scratch.obj == NULL) {
+		DRM_ERROR("scratch page not allocated for %s\n", ring->name);
+		return -EINVAL;
+	}
+
 	ret = lrc_setup_wa_ctx_obj(ring, PAGE_SIZE);
 	if (ret) {
 		DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
@@ -1657,7 +1663,8 @@ static int logical_render_ring_init(struct drm_device *dev)
 	ring->emit_bb_start = gen8_emit_bb_start;
 
 	ring->dev = dev;
-	ret = logical_ring_init(dev, ring);
+
+	ret = intel_init_pipe_control(ring);
 	if (ret)
 		return ret;
 
@@ -1672,9 +1679,10 @@ static int logical_render_ring_init(struct drm_device *dev)
 			  ret);
 	}
 
-	ret = intel_init_pipe_control(ring);
-	if (ret)
+	ret = logical_ring_init(dev, ring);
+	if (ret) {
 		lrc_destroy_wa_ctx_obj(ring);
+	}
 
 	return ret;
 }
-- 
2.3.0

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